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4 years ago

10

Four students took a national standardized test for which the mean was 500 and the standard deviation was 100. If a student’s z-

value was 1.75 on the test, what was the student’s score?

2 answers:

murzikaleks [220]4 years ago

3 0

z = (x - 500) / 100

1.75 = (x - 500) / 100

175 = x - 500

675 = x

g100num [7]4 years ago

3 0

Answer:

A, 675

Step-by-step explanation:

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(1/p-p)(1/p-q)-q/p^2(1/q+qp^2)

Grace [21]

The answer for this is undefined

6 0

3 years ago

Help please! I do not exactly understand how to do this. Thanks!

Radda [10]

X and Y are supplementary, that means X + Y = 180.

But we have, X = Y +24, then

X + Y = Y + 24 + Y = 2Y + 24 = 180

Then

2Y = 156

Y = 78

Then X = 78 + 24 = 102.

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3 years ago

In a basketball game Fintan made 16 baskets. Each of the baskets is worth either 2 or 3

jekas [21]

Let x represent a 2-point basket, and y represent a 3-point basket.

Basket equation: x + y = 16
Point equation 2x + 3y = 39

Solve using system of equations:
if x + y = 16, then x = 16 - y

Plug into the second equation:
2(16-y) + 3y = 39
32 - 2y + 3y = 39
32 + y = 39
y = 7

So the number of 3-point baskets scored was 7. Hope this helps, let me know if there’s a step you don’t understand! :)

8 0

3 years ago

How would 2X + Y = 13 be written in slope-intercept form?

yan [13]

Answer:

$y=-2x+13$

Step-by-step explanation:

For reference, slope-intercept form is:

$y=mx+b$

$(m=slope)$

$(b=y-intercept)$

For the equation $2x+y=13$ to be written in slope-intercept form, all we must do is subtract $2x$ from both sides of the equation:

$2x+y=13$

$y=-2x+13$

4 0

3 years ago

The country of Freedonia has decided to reduce its carbon-dioxide emission by

Goshia [24]

Answer:

$\\E(t) =40(0.65)^{t}$

Step-by-step explanation:

Since the country wants to reduce the emission by the percentage each year, the function will be decaying function. The formula of decaying function will look like this

$E(t) =E_{0} (1-r)^{t}\\$

Where

E(t) = the number of emission after t years

E0= the number of initial emission= 40 million tons

r=rate of growth/decay = 35%= 0.35

t= time in years

If we put the number, the equation will be:

$E(t) =E_{0} (1-r)^{t}\\E(t) =40(1-0.35)^{t}\\E(t) =40(0.65)^{t}$

3 0

4 years ago